Ski



FIG. 1 is a perspective view of a ski, taken from the front, upper, right, showing my new design;

FIG. 2 is bottom plan view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top plane view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a front elevation view thereof; and,

FIG. 7 is a rear end elevation view thereof. 

The ornamental design for a ski, as shown and described. 